{"id":"a1d5c186-5dbb-4700-aefd-58815dc83d3a","shortId":"x6sYXE","kind":"x402","title":"x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides access to portfolio transaction data via an x402 payment-gated POST request. The specific resource `/api/v1/portfolios/90/transactions` is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all settled on the Base network using USDC.\n\nThe x402 challenge confirms the endpoint is live and accepts payments via the \"exact\" scheme on Base mainnet. The maximum amount required per call is 20,000 base units of USDC (0x8335…2913), which equals $0.02 USD (USDC uses 6 decimals). The platform advertises a flat $0.02/request pricing model with no API keys, no rate limits, and instant access.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the portfolio transactions endpoint actually returns or what parameters it accepts. The endpoint path suggests it retrieves or creates transactions for portfolio ID 90, but this is inference only. The platform appears to be a demonstration or early-stage x402 API marketplace.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-request","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 paid API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The specific portfolio ID '90' in the path is unexplained — unclear if this is a fixed demo or parameterizable","Platform appears to be early-stage or a demonstration; reliability and data quality are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/90/transactions","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/portfolios/90/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response documentation, no examples, and the docs pages are empty. The purpose of this specific endpoint (portfolio 90 transactions) is unclear beyond path 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'/request':132 '0.02':120,131 '000':111 '0x8335':116 '20':110 '2913':117 '6':124 '90':203 'Base network API' 'USDC micropayment API' 'accept':94,190 'access':34,144 'actual':184 'advertis':128 'ai/ml':70 'amount':105 'analyt':69 'api':66,137,151,221 'appear':211 'base':8,22,81,101,112 'base-network' 'broader':55 'call':12,26,108 'challeng':87 'confirm':88 'connect':160 'content':166 'creat':198 'data':38,68,73 'decim':125 'demonstr':215 'descript':177 'doc':150 'document':145 'dozen':60 'earli':218 'early-stag':217 'endpoint':6,20,30,90,183,192 'equal':119 'exact':98 'exampl':174 'extrem':147 'finance/web3':72 'flat':130 'gate':3,17,44 'id':202 'infer':71,207 'instant':143 'key':138 'limit':141 'live':92 'lowpaymentfee' 'lowpaymentfee.com':32,57 'mainnet':102 'marketplac':222 'maximum':104 'model':134 'network':82 'no-api-key' 'offer':59 'openapi':170 'page':155 'paramet':188 'part':52 'path':193 'pay':10,24,63 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':62 'payment':43,95 'payment-g':42 'per':11,25,64,107 'platform':56,127,210 'portfolio':4,18,36,181,201 'portfolio transactions API' 'portfolio-transactions' 'post':45 'price':133,152 'prompt':162 'provid':33 'rate':140 'readm':154 'render':157 'request':46,65 'request/response':173 'requir':106 'resourc':49 'retriev':196 'return':185 'schema':171 'scheme':99 'servic':76 'settl':78 'span':67 'spars':148 'specif':48 'stage':219 'substant':165 'suggest':194 'transact':5,19,37,182,199 'unit':113 'usd':121 'usdc':14,28,84,115,122 'usdc-settlement' 'use':83,123 'util':75 'via':39,96 'wallet':161 'x402':2,16,41,86,220 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"8b452dc4-cc30-4c43-b2e5-8f624e3f6761","listingId":"a1d5c186-5dbb-4700-aefd-58815dc83d3a","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/portfolios/90/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:41.678Z"}],"sources":[{"listingId":"a1d5c186-5dbb-4700-aefd-58815dc83d3a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/90/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:41.678Z","lastSeenAt":"2026-04-27T14:05:19.509Z"}],"details":{"listingId":"a1d5c186-5dbb-4700-aefd-58815dc83d3a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/90/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/90/transactions"},{"claim":"Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/90/transactions"}],"useCases":["Retrieving or submitting portfolio transaction records via a single paid API call","Integrating pay-per-request financial data into agent workflows without API key management","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents needing keyless, pay-per-call access to portfolio data","Projects exploring micropayment-settled API consumption on Base"],"notFor":["Production use cases requiring documented request/response schemas","High-volume batch data retrieval where per-call pricing is inefficient","Users who need detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.591Z"},"updatedAt":"2026-04-27T14:05:19.509Z"}}